sort these molecules into the appropriate bin according to their polarity. HBr. CO2. BF3. H2. CH4. NH3

Answer:

an iconic bond is formed by the complete transfer of some electrons from one atom to another

Explanation:

the atom losing one or more electrons become a cation. a positively charged ion the atom gaining one or more electrons become an anion. a negatively charged ion

Answer:

Raise

Explanation:

One calorie (cal) is the amount of heat needed to raise the temperature of one gram of water one degree Celsius.

Answer:

the answer is 5.1 1049 mol.

Answer:

Dalton's atomic model and Rutherford model

Explanation:

There were differences in the models:

Thompson's experiment showed that atoms contained tiny negatively charged particles called electrons.

On the other hand, Rutherford gold experiment led to the conclusion that the atom is a empty space with tiny, dense and positively charged nucleus.

Dalton thought that atoms were the smallest units of matter that could not be broken down further. This assumption continued to hold until it was later discovered that the atom was composed of subatomic particles.

Answer:

Explanation:

Nitrogen has a lone pair of electrons. That would mean that NH3 is minus at the left end in this case.

 H

:N  H

H

Methane has its Hs 90 degrees (approximately apart.

    H

H  C  H

    H

The pulling forces on the methane cancel each other out. When that happens the chemical is non polar.

A balanced equation obeys the law of conservation of mass. Here the balanced equation for the decomposition of Barium sulfide is 8 BaS → 8Ba + S₈. The correct option is A.

A chemical equation in which the amount of reactants and products on both sides of the equation are equal is defined as the balanced equation. The number of atoms of each element of the reactants and products are same on either side of the equation.

Here the balanced equation for the decomposition of Barium sulfide is denoted as:

8BaS→ 8Ba + S₈

The number of 'Ba' and 'S' atoms on both sides of the equation are equal.

Thus the correct option is A.

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Answer:

N2 + H2 ----------》NH3

On balancing it

N2. + 3.H2------->2.NH3

( 1 mol) (3 mol) (2 mol)

1 mol of nitrogen reacts with 3 mol of hydrogen to give 2 mol of ammonia.

Likewise,

20 litres of nitrogen reacts with 60 litres of hydrogen to give 40 litres of Ammonia.

Hence, the answer is 40 Litres.

Answer:

The Greeks called these particles atomos, meaning indivisible, and the modern word “atom” is derived from this term. Democritus proposed that different types and combinations of these particles were responsible for the various forms of matter.

Explanation:

hope it helps

The idea of indivisibility of the atom upheld by Dalton was largely derived from early Greek philosophers.

John Dalton was the first scientist to begin an empirical study of atomic theory. Before this time, all that was known about the atom were largely based on the speculation of Greek philosophers.

However, one recurring theme among Greek philosophers is that atoms are indivisible. This idea that atoms are indivisible became a very strong pivot of the Dalton's theory of the atom.

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Answer:

It can be formed either through a process of evaporation or sublimation. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form

Explanation:

hope it help

Answer:

No. Unlike clouds, fog, or mist which are simply suspended particles of liquid water in the air, water vapour itself cannot be seen because it is in gaseous form

A molecule with hydrophobic properties and polar molecular attributes would be called an amphiphilic molecule.

An amphiphilic molecule is characterized by having both hydrophobic (nonpolar) and polar properties. The term "amphiphilic" comes from the Greek words "amphi," meaning "both," and "philos," meaning "loving." These molecules possess regions or groups that are hydrophobic, meaning they repel or are insoluble in water, and regions or groups that are polar, meaning they have an affinity for water or are soluble in water.

The hydrophobic part of an amphiphilic molecule typically consists of nonpolar hydrocarbon chains or aromatic rings, which do not readily interact with water molecules. This hydrophobic portion tends to aggregate or cluster together to minimize contact with water, forming structures such as micelles or lipid bilayers.

On the other hand, the polar part of an amphiphilic molecule contains polar functional groups, such as hydroxyl (-OH) or amino (-NH₂) groups, which have an affinity for water. These polar groups can interact with water molecules through hydrogen bonding or other polar interactions.

The combination of hydrophobic and polar properties in amphiphilic molecules allows them to interact with both hydrophobic and hydrophilic environments, making them important in various biological processes, such as cell membrane structure and function, surfactant formation, and emulsion stabilization.

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The presence of a pink impurity in crude benzoic acid solid may be due to contaminants during manufacturing, incomplete purification, or chemical reactions/degradation. Further purification and analysis methods can help identify and remove the impurity for a higher-quality product.

There may be numerous explanations for the trace quantity of pink impurity seen in crude benzoic acid solid:

1. Contaminants during the manufacturing process: The crude benzoic acid may have been produced through a chemical synthesis or extraction process where impurities were introduced unintentionally. These impurities could have different chemical compositions and colors, leading to the presence of the pink impurity.

2. Incomplete purification: The crude benzoic acid may not have undergone thorough purification steps to remove all impurities. Purification methods such as filtration, recrystallization, or chromatography are typically employed to separate impurities from the desired compound. If the purification process was not conducted adequately, some impurities, including the pink impurity, may remain in the final product.

3. Chemical reactions or degradation: The pink impurity could be a result of chemical reactions or degradation of the benzoic acid during storage or handling. Exposure to light, heat, or other reactive substances can cause the formation of new compounds with different colors.

To ensure the purity of benzoic acid, further purification techniques or analysis methods, such as spectroscopy or chromatography, can be employed to identify and remove the pink impurity, resulting in a higher-quality product.

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Most of the weather of the world is based upon changes in the moisture, pressure or temperature of the troposphere.

The layer closest to the surface of the Earth is troposphere. This layer goes up to twenty kilometers above the Earth. The troposphere is very essential as it contains the weather of the Earth and also greenhouse gases to maintain the temperature on Earth.

Troposphere layer has the air humans breathe and the clouds in the sky. The air is densest in this lowest layer and the troposphere has three-quarters of the mass of the entire atmosphere. The air in troposphere is 78% nitrogen and 21% oxygen.

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0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

Volume of HCl solution = 12.6 mL = 0.0126 L

The concentration of HCl solution = 0.14 M We have to find the amount of KOH required to neutralize the given volume and concentration of HCl.

In order to calculate the amount of KOH, we need to first calculate the number of moles of HCl using the formula of Molarity;

Molarity = (Number of moles of solute) / (Volume of solution in liters)0.14 M = n(HCl) / 0.0126L0.14 × 0.0126 = n(HCl)n(HCl) = 0.001764 moles of HCl

Now, the balanced chemical equation for the reaction of KOH with HCl is;KOH + HCl → KCl + H₂OOne mole of KOH reacts with one mole of HCl.

Therefore, the number of moles of KOH required to neutralize the given amount of HCl would be equal to 0.001764 moles. Now, let's calculate the amount of KOH in grams.

Molar mass of KOH = 39.1 + 16.00 + 1.008 = 56.108 g/mol0.001764 moles of KOH would weigh = 0.001764 × 56.108 = 0.0989

hence, the amount of KOH required to neutralize the given volume and concentration of HCl would be 0.0989 grams.

Thus, 0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

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Explanation:

Mass=176g

Volume of cube= length ^3

=4 x 4 x 4

=64cm^3

Density = mass/volume

=176/64

=2.75g/cm^3

Incomplete question. However, I provided a specific example of stewardship of the atmosphere.

Explanation:

First, note that the term stewardship refers to the belief that humans are obligated to take care and look after our environment (which includes the atmosphere.

An example of this is: deciding to change our mode of transportation: What this entails is that we may decide to switch to riding a bicycle to places rather than going by car. By so doing you will be reducing the number of greenhouse gases emitted into the environment as bicycles do not emit harmful gases when used.

The frequency of the excited photon is  4.5 x 10¹⁴ and it belongs to the infrared region of the spectrum.

The wavelength of the excited electron is 656.4nm.

The relation between the frequency and the wavelength of the electron is,

u = c/y

Where,

u is the frequency,

c is the speed of the photon,

y is the wavelength of the photon.

Here, c is equal to the speed of the light.

Putting values,

u = 3 x 10⁸/656.4 x 10⁻⁹

u = 4.5 x 10¹⁴

This range of frequency belongs to the Infrared region of the Electromagnetic spectrum.

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The compound is polar and the compound is T shaped.

We know that the Lewis structure of a compound tells us the way that electrons are arranged around a central atom in a compound. We can see that the Lewis structure would consist of the central atom and then the atoms that are surrounding the central atom of the molecule.

In any case, the valence electrons that surround each of the atoms in the compound would be shown as dots and they would surround the symbol of the elements to  which the atoms belong. We can now look up at the structure and be able to deduce what the compound can be able to look like.

The compound as shown is polar because of the fact that he compound is non symmetrical.

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Answer:

1. Insulin

2. Keratin

Explanation:

Proteins are one of the four biological molecules found in living systems. They are polymeric molecules made up of monomeric units called AMINO ACIDS. Proteins perform a wide variety of functions in the body ranging from enzymatic functions to structural roles.

Two examples of proteins found in the body are keratin, insulin. Keratin is a structural protein located in the skin, hair and nails while insulin is an enzymatic protein that aids in digestion.

The molar mass of h2x is 47.22 g.

The molar mass of a chemical compound is defined because the mass of a pattern of that compound is divided by using the amount of substance that's the number of moles in that sample, measured in moles. The molar mass is a bulk, no longer molecular, an asset of a substance.

Calculation:-

n factor of acid = 2

H2X + 2NaOH ----> Na2X + 2H2O

1 mole = 2 NaOH

H₂X = 1.70 g

volume of NaOH = 40 ml = 0.04 L

Molarity = mole /volume

         = (mass/molar mass) / volume

2* 0. 450   = (1.70/molar mass) / 0.05

molar mass = 1.70/0.450 * 0.04 *2

                  = 47.22 g

Molar mass is defined because of the mass in grams of 1 mole of a substance. The devices of molar mass are grams in line with mole, abbreviated as g/mol. The mass of an unmarried isotope of any given element (the isotopic atomic mass) is a cost concerning the mass of that isotope to the mass of the isotope carbon-12.

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Answer:

okay your question in science

The graph would indicate an inverse linear relationship between pressure and volume. Option B

The graph would indicate a direct inverse relationship between pressure and volume. In other words, as the volume decreases, the pressure increases, and as the volume increases, the pressure decreases.

This relationship is known as Boyle's Law, which states that for a fixed amount of gas at a constant temperature, the product of pressure and volume is constant.

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Missing parts:

Assume that temperature and number of moles of

gas are constant in this problem.

Use the graph to complete the statement below.

This graph shows that pressure and volume have

✓

a direct linear relationship

an inverse linear relationship

a direct nonlinear relationship

an inverse nonlinear relationship

Answer: a direct linear relationship

Explanation:

Answer:

NA + F2 = NAF - Chemical Equation Balancer.

2 Na + F 2 → 2 NaF

Na is a reducing agent, F 2 is an oxidizing agent. ; Pale-yellow to greenish gas with a pungent, irritating odor.

Answer

1.50 mol

Explanation

Given:

Initial volume, V₁ = 25.0 L

Mass of CH4 gas in 25.0 L container = 40 g

Final volume, V₂ = 15.0 L

From the Periodic Table; molar mass of CH4 = 16.04 g/mol

What to find:

The new amount in mole.

Step-by-step solution:

According to Avogadro’s law: For a confined gas, the volume (V) and number of moles (n) are directly proportional if the pressure and temperature both remain constant. That is:

n₁ = Mass/Molar mass = (40.0g/16.04 g/mol) = 2.493765586 mol

n₂ is the new amount in mole and can be calculated as follows:

The new amount in moles is 1.50 moles

The solubility of KCl at 90°C is 144 g/L.

To calculate the solubility of KCl at 90°C, we need to determine the amount of KCl that dissolves in 1 dm³ of water at that temperature. The solubility of a compound is typically expressed in terms of the mass of the compound that dissolves in a given volume of solvent.

Given:

Mass of KCl = 144 g

Volume of water = 1 dm³

Step 1: Convert volume to liters

1 dm³ = 1 L

Step 2: Calculate the solubility

Solubility = Mass of solute / Volume of solvent

Solubility = 144 g / 1 L = 144 g/L

It's worth noting that the solubility of KCl can vary with temperature. The given solubility value is specific to the conditions provided (90°C). If the temperature changes, the solubility of KCl may also change. Solubility is often reported as a function of temperature to reflect this relationship.

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When 1 equivalent of HCl is added to the diene, one of the carbon-carbon double bonds acts as the nucleophile and the other acts as the electrophile.

The addition product formed when one equivalent of HCl reacts with the diene shown is given as follows:

Diene can undergo addition reactions with electrophilic reagents, like HCl. HCl adds to the diene in a stepwise manner to give the addition product. When 1 equivalent of HCl is added to the diene, one of the carbon-carbon double bonds acts as the nucleophile and the other acts as the electrophile. HCl electrophilically adds to the double bond with the lesser number of hydrogen atoms attached to it, and the hydrogen atom attached to the adjacent carbon atom moves to the other carbon atom to give a more stable intermediate.  Therefore, the HCl addition product is formed.

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The pressure within a gas container that is sealed would rise as the temperature climbed. The right answer is B.

This is easily understood by picturing how the gas particles in the container move more energetically as the temperature rises. This indicates that there are more contacts between them and the container's sidewalls, increasing the pressure.

The pressure inside a closed container of gas is brought on by collisions between the gas's particles and the container's walls. The pressure of the gas increases with the frequency of collisions.

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Answer:

D. Burning a peice of wood

Explanation:

Because when you burn wood a chemical reaction happenes between the flames and the wood making the wood into ashes.

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The dissolving salt in water is an an example of a chemical change. The correct option is A.

A chemical change, also known as a chemical reaction, is the production of new substances with changing chemical compositions and characteristics.

In water, sodium chloride dissociates into Na+ ions and Cl- ions, which may be described as a chemical process.

The ionic connections between the atoms are broken as salt dissolves. Because the reactant (sodium chloride or NaCl) varies from the products (sodium and chloride ions), a chemical reaction takes place.

Thus, the correct option is A.

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Answer:

A

Explanation:

Your answer is A

Answer:

A is the answer

Explanation: